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A copper-based electrical contact composite material for low-voltage electrical appliances and its warm-pressing forming process

A composite material and electrical contact technology, which is applied to contacts, circuits, electrical switches, etc., can solve the problems affecting the performance of electrical contacts, and the performance of arc ablation resistance needs to be improved, so as to improve the anti-oxidation performance and comprehensive performance. Anti-arc ablation performance, resource-rich effect

Inactive Publication Date: 2016-04-20
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above materials have good electrical conductivity, anti-welding performance, oxidation resistance, wear resistance and electrical conductivity, their arc ablation resistance needs to be improved, which affects the performance of electrical contacts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The composition weight ratio of the material of the embodiment of the present invention is: 2% bismuth, 2% tungsten carbide, 0.08% lanthanum-rich mixed rare earth, 0.4% zinc stearate, and the rest is copper. Prepared using the following steps:

[0018] (1) Melt the lanthanum-rich mixed rare earth material and copper according to the ratio, and then use the atomization method to make rare earth-copper powder particles, mix rare earth-copper powder (200-400 mesh) and bismuth powder (200-400 mesh), carbonize Tungsten (200-400 mesh) and zinc stearate are ball-milled and mixed according to the ratio. The ball-milling time is 1.5 hours, and the ball-to-material ratio is 15:1;

[0019] (2) The uniformly mixed powder is warm-pressed, the temperature is 120°C, the pressure is 500MPa, and the holding time is 2 minutes;

[0020] (3) Pre-sinter the warm-pressed parts under the protection of argon gas, the pre-sintering temperature is 400°C, the time is 30 minutes, and then vacuum ...

Embodiment 2

[0024] The composition weight ratio of the material in the embodiment of the present invention is: 2% bismuth, 0.5% tungsten carbide, 0.08% lanthanum-rich mixed rare earth, 0.4% zinc stearate, and the rest is copper.

[0025] This group adopts the same process step and parameter of embodiment 1.

[0026] Basic properties of this material: ① Density: 8.26 (g / cm 3 ); ② Resistivity: 2.10 (μΩ.cm) ③ Hardness: 38 (HB).

Embodiment 3

[0028] The composition ratio of the material in the embodiment of the present invention is: 2% bismuth (200-400 mesh), 4% tungsten carbide (200-400 mesh), 0.08% lanthanum-rich mixed rare earth, 0.4% zinc stearate, and the rest is copper. Prepared using the following steps:

[0029] This group adopts the same process steps and parameters as in step (1) and step (2) of Example 1, and then puts the sample into a high-temperature resistance furnace, first pre-burns it under an argon protective atmosphere for 30 minutes, and then conducts it under vacuum Sintering, the sintering temperature is 850°C, and the holding time is 1.5 hours.

[0030] Basic properties of this material: ① Density: 8.26 (g / cm 3 ); ② Resistivity: 3.75 (μΩ.cm) ③ Hardness: 50 (HB).

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Abstract

The invention relates to a copper-based electric contact composite material and particularly relates to a method of manufacturing the copper-based electric contact composite material by adopting the warm compaction technology. the copper-based electric contact composite material of the invention is composed of the following materials proportioned by weight: 0.5 to 4% of bismuth, 0.5 to 4% of tungsten carbide, 0.05 to 0.8% of lanthanum-enriched mixed rare earth, 0.02 to 1% of zinc stearate, and the rest of copper and other unavoidable impurities. The material of the invention is manufactured in the method of mixing, powder warm compaction, presintering under the protection of inert gas and sintering under protection of vacuum or nitrogen. The copper serves as the base, resources of the main raw materials are rich, electricity conductivity performance and heat conductivity performance, fusion welding resistance, arc ablation resistance and friction resistance of the material can be comparable with a silver base, basic requirements of en elastic contact and other parts on the material can be met, and outstanding arc ablation resistance performance, good oxidation resistance performance, excellent self-lubrication performance and wear resistance performance are provided.

Description

technical field [0001] The invention relates to a copper-based electrical contact composite material, in particular to a method for preparing the copper-based electrical contact composite material by using a warm-press forming process. Background technique [0002] Electrical contact materials can be used as electrical contacts and electrical contactor materials for electrical switches, instruments and meters, and are responsible for the task of connecting and breaking currents. Therefore, their performance directly affects the reliable operation of electrical switches and instruments. and service life. Studies have shown that the phenomenon of arc burnout during the opening and closing process of electrical contacts is extremely complex. Under the combined action of arc energy, contact pressure and environmental factors, physical metallurgical processes such as heating, melting, vaporization, flow and solidification occur on the contact surface. process, resulting in softe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H1/025C22F1/08
Inventor 耿浩然牟振赵德刚冯沙沙左敏
Owner UNIV OF JINAN